A Method for Manufacturing Hot Dip Galvanized Steel Sheets Having Mini Spangle

摘要

PURPOSE: A method for manufacturing mini-spangle hot dipped galvanized iron is provided to produce small and uniformed spangles by adding colloidal silica or/and alumina to an aqueous solution or water which is sprayed before solidification of an existing plating layer. CONSTITUTION: The method for manufacturing mini-spangle hot dipped galvanized iron is characterized in that 0.001 to 10 wt.% of colloidal silica or/and alumina is added to the aqueous solution or water in manufacturing hot dipped galvanized iron by spraying an aqueous solution or water before solidification of a galvanized layer, wherein a pH of the added solution is in the range of 2 to 12. Small and uniformed spangled hot dipped galvanized iron can be obtained, and spraying of a solution is easily carried out by adding colloidal silica or/and alumina to the aqueous solution or water compared to an existing method for manufacturing hot dipped galvanized iron in which small spangles are obtained by spraying water or phosphate aqueous solution before solidification of the plating layer.